Chaeles e



(No Model.)

G. R. MEAD.

LATHE GHUGK.

fPatentd July?. 1885.. A

lll/rl lll tra STATES Parar einen@ CHARLES R. MEAD, OF COMMUNITY, NEWYORK.

SPECIFICATION forming part of Letters Patent No. 321,740, dated July 7,1885.

Application led April 13, 1885.

To all whom it may concern:

Beit known that I, CHARLEs R. MEAD, of Community, in the county ofMadison, in the State of New York, have invented new and usefulImprovements in Chucks, of which the following, taken in connection withthe accompanying drawings, is a full, clear, and exact description. j

This invention relates to the class of chucks which are designateduniversal chucks, and in which the jaws are made to synchronously movetoward or from the center of the chuck for holding work or tools ofdifferent sizes.

My invention consists in a novel construetion and combination of thecomponents of the chuck, having jaws pivoted eccentrically in relationto their grippingfaces, so as to carry the latter toward and from thecenter of the chuck by the turning of said jaws, all as hereinafter morefully described, and set forth in the claims.

In the annexed drawings, Figure I is a longitudinal section of myimproved chuck/taken on line m x, Fig. II. Figs. II, III, and IV aretransverse sections taken, respectively, on lines u a, y y, and z z,Fig. I. Fig. V is a face view of the chuck; Fig. VI, a rear end view ofthe same, and Fig. VII a detached View of one of the jaws.

Similar letters of reference indicate corresponding parts. I

H denotes the chuck-head, consisting of a cylindrical body adapted to besecured to the live-spindle of a lathe in any suitable and wellknownmanner. Upon the head is mounted a sleeve, S, which is fitted looselythereon, so as to allow it to be rotated about the head H, and isconfined longitudinally, so as to prevent its movement endwise, by anannular band, f, attached to the rear end ofthe sleeve, and entering acircumferential rabbet, e, in the back of the head H, which bandprevents the movement of the sleeve outward from the chuck. The movementin the opposite direction is prevented by the jaws and theirsupporting-rings hereinafter described.

AAA represent the jaws of the chuck. rlhese jaws are of cylindricalform, and provided with transverse ribs n n, constituting segmentalgripping-faces, and are also provided with journals d andvdone of whichpro- (No model.)

with journal-bearings@ c c for thc reception of the end journals, d d d,of the jaws. Another ring, r', provided with correspondingjournal-bearings, c c c, is arranged inside of the sleeve S in such aposition as to receive thc journals d d d of the jaws A A A. In order toadmit of applying this ring r to the jaws, and of removing it from sainewhen required for repairing or renewing either of said parts, I formsaid ring of two detachable concentric annular sections arranged onearound the otherand each provided with a portion of the respectivejournal-bearings c c c. rIhe outer of said sections is subdividedtransversely,and detachably secured to the interior of the sleeve, asrepresented in Fig. 3 of the drawings. The abutment of the ends of thejaws against the face of the head and inner side of the outer ring, r,together with the band j', engaging the rabbet c in the back of the headH, effectually prevents the sleeve S from movinglongitudinally. The faceofthe chuckhead H is provided with segmental camgrooves a au, describedfrom centers equidistantly apart and equidistantly from the center ofthe' head H, as shown in Fig. 2 of the drawings. On the ends of the jawsadjacent to the face of the head H are lugs?) I) b, which extend intocarngrooves a a a. Said lugs are arranged near the gripping-faces of thejaw, and thus farthest from the axis of the journals ci d.

The sleeve S, with the rings r i", constitute a rotary jaw-carrier,which has its axis parallel with that of the chuck-head, and by turningsaid jaw-carrier in the direction indicated by arrows in Figs. 2 and 4of the drawings the travel of the lugs b b in the cam-grooves a a causesthe jaws A A to turn so as to carry their gripping-faces synchronouslytoward the axial center of the chuck, and a reverse movement of thedescribed jaw-carrier causes the jaws to move outward, the chuck havingthus a universal adjustment to hold work or tools of different sizes.

I do not limit my invention to thc employA IOO nient of the cani-groovesa a. and lugs b b in connection with the pivoted jaws, inasmuch asworm-gears, spiral gears, and other adjusting devices used on otherchucks are also applicable to this chuck.

lVhat I claim as niy invention is- 1. The combination, With thechuck-head, of a sleeve arranged rotatively about said head and parallelwith the axis thereof, journalbearings on said sleeve eccentric to theaxis of thechuck, and jaws pivoted in said bearings eccentrically inrelation tothe gripping-faces of the jaws, substantially as describedand shown.

2. The combination, with the chuck-head provided with segmentalcam-grooves a a ain the face thereof, of the sleeve S, arrangedrotatively and confined longitudinally on the cimeli-head,journal-bearings on the sleeve, and jaws pivoted in said bearingseccentricall y in relation to their gripping-dices, and provided withlugs b Z b, extending into the grooves e a a, substantially as describedand shown.

3. The eombi11ation,v'ith the head H, of the rotary sleeve S, projectingfrom said head, journal-bearings attached to the interior of' theprojecting portions of the sleeve and equidistant from the centerof thechuck, and jaws pivoted in said bearings eecentrically in relation tothe gripping-faces ofthe jaws, substantially as described and shown.

4. ln combination with the chuck-head H and the rotary sleeve S,projecting from said head and coulined longitudinally thereon,\the ringsr r', detachably connected to the interior of the sleevc,and providedwith the journal-bearings c c c, and the jaws A A A, confined betweenthe chuck-head and outer ring, Q', and having eccentric journals d d inthe bearings c c c, substantially as described and shown.

5. In combination with the chuck-head II, rotary sleeve S, and jaws A A,having eccentric journals d d, the ring r, secured to the outer end ofthe sleeve and provided with the j ournal-bearings c c, and the ring r',composed of two detachable concentric annular sections arranged onesurrounding the other, each provided with a portion of the respectivejournal-bearings c c, and the outer section. being subdividedtransversely and detachably connected to the sleeve, substantially asdescribed and shown.

6. The improved chuck composed of the cylindrical head H, provided withthe rabbet c and segmental cam-grooves a a a, the sleeve S, mountedloosely on said head and projecting therefrom, the band f on the sleeve,entering the rabbet c, the ring r secured to the outer end of thesleeve, and provided With journalbearings c c, the ring r', composed ofdetachable sections detachably connected to the nterior of the sleeve,and provided with journalbcaringsrc, andthe jaws A A, provided withjournals d d', eccentric in relation to the gripping-faces of the jaws,and lugs b b on the in ner end of the jaws,extending into the grooves aa, all constructed and combined substantially inthe manner specified andshown.

In testimony whereof Ihavehereuntosigned my name and affixed my seal, inthe presence ot' two attesting Witnesses, at Oneida, in the county ofMadison, in the State of New York,

`this Qthday of April, 1885.

CHARLES R. MEAD.

